feat: crisis message after the test and non-blocking; weapon answer triggers nothing; ЕМИАС demo = Никита

- CRISIS_BLOCKING (default off for the demo): a crisis no longer locks the dialog; the message and the
  doctor's acute alert still happen. The clinical protocol (blocking, immediate stop) stays behind the flag and
  keeps its tests.
- Crisis signals inside a questionnaire (intake red flags, high C-SSRS, PHQ-9 item 9) no longer stop it: the
  test is finished and the crisis message comes at the end; the doctor's alert is raised at once/at the end.
- Weapon access: asked and stored, triggers nothing (rule disabled, no red flag, no safety block).
- ЕМИАС demo persona is «Никита В.»; the one-click demo stays «Андрей С.».

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/api/fixtures.py

@@ -25,7 +25,8 @@ DOCTOR_ID = "doc-smirnova"
 
 # Synthetic personas for the demo console and the demo ЕМИАС sign-in of the patient web app.
 DEMO_PERSONAS: list[DemoPersona] = [
-    DemoPersona(token="tok-andrey", display_name="Андрей С.", therapy_day=13, scenario="data/synthetic/andrey.jsonl"),
+    # ЕМИАС demo sign-in shows this persona as «Никита В.» (the one-click demo on the welcome screen is «Андрей С.»).
+    DemoPersona(token="tok-andrey", display_name="Никита В.", therapy_day=13, scenario="data/synthetic/andrey.jsonl"),
 ]